<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <ul class="container">

    </ul>
    <script>
        var arr = ["张三","李四","王五"];
        var str = '' ;
        var str1 = '<li>' ;
        var str2 = '</li>' ; 
        for(var i = 0 ; i < arr.length ; i ++ ) {
            str = str + str1 + arr[i] + str2 ; 
        }
        var ulEle = document.querySelector(".container") ; 
        ulEle.innerHTML = str ;
    </script>
</body>
</html>